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The medic card says that they can “remove ALL cubes of one colour when doing Treat Disease”.

One interpretation from the rules is that Treat Disease applies only to the city you are in. However another implication from the above wording is that ALL the cubes of that colour wherever they may be on the board are removed.

While it could the text could be clearer, the answer gives the universally-accepted reading of the rule (in my experience, which has seen many games with many people). This is already an extremely powerful ability with that reading.
– ikegamiSep 22 '19 at 21:19

3

And it can be confirmed by playing the app version, which definitely applies the effect only to the city the Medic is in.
– ConManSep 22 '19 at 23:21